Re: [R] help subsetting data based on date AND time

Steve, Just below are some examples that I hope will help. With regard to what you've tried, I don't see any reason for using with(), or the select argument to subset(). They both look unnecessary to me. ## examples of subsetting date-time values ## create fake data tmp <- seq(as.POSIXct('2011-0

Re: [R] help subsetting data based on date AND time

Try altering your subset operation from this: with(DataSet, subset(DataSet, DataSet$NewDateTime < '2004-08-05 14:15:00')) to this: with(DataSet, subset(DataSet, DataSet$NewDateTime < as.POSIXct('2004-08-05 14:15:00'))) and see if you get the desired effect. The statement DataSet$NewDateTime <

[R] help subsetting data based on date AND time

Dear R Community, I am new to R, and have a question that I suspect may be quite simple but is proving a formidable roadblock for me. I have a large data set that includes water-quality measurements collected over many 24-hour periods. The date and time of sample collection are in a combined Dat